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Schedule II - Valuation and Qualifying Accounts | 12 Months Ended
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Dec. 31, 2018
Notes to Financial Statements |
SEC Schedule, 12-09, Schedule of Valuation and Qualifying Accounts Disclosure [Text Block] | Schedule II – Valuation and Qualifying Accounts (in millions)
Allowance for Doubtful Accounts, Revenue Adjustments and Other for the Years Ended: |  | Balance at Beginning of Year |  |  | Charged to Expense/ Against Revenue |  |  | Write-Offs, Net of Recoveries |  |  | Balance at End of Year |
December 31, 2016 |  |  | 9.9 |  |  |  | 19.5 |  |  |  | (16.0 | ) |  |  | 13.4 |
December 31, 2017 |  |  | 13.4 |  |  |  | 29.3 |  |  |  | (18.7 | ) |  |  | 24.0 |
December 31, 2018 |  |  | 24.0 |  |  |  | 35.7 |  |  |  | (23.9 | ) |  |  | 35.8 |
All other schedules have been omitted either because they are not applicable or because the required information is included in our Consolidated Financial Statements or the notes thereto.

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- Definition The entire disclosure for valuation and qualifying accounts and reserves. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 12 -Subsection 09 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 4 -Subparagraph (SX 210.12-09) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e24092-122690 + Details
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